Spirit of the Moon Tower

The Gwendarlin College is open to all who wield magic. It welcomes full-fledged wizards, descendants of nearly exterminated witches, and even half-blooms whose magic works incorrectly.
Lilith enrolls in the first year of the college to finally tame the uncontrollable power... within herself. However, the girl faces disdain from her classmates, as she is a half-bloom, a mockery of magic. She will have to stand up for herself, but how can she do that when something terrible is happening in the college?
Every month, an evil spirit plunges all the inhabitants of the castle into a deep sleep, takes magical powers from one of the students, and sends nightmares to others. This has been happening for many years, and one day the ghost chooses Lilith as its target and begins the hunt for her soul. Will the girl be able to escape from her pursuer? What secrets does the college hold, and what does the evil spirit want?